package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@RequiredArgsConstructor
public class UserServiceImpl implements UserService {
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    private final WeChatProperties weChatProperties;
    private final UserMapper userMapper;

    /**
     * 用户登录接口
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信登录接口获取openid
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空
        if(openid == null || openid == "") throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        //判断是否为新用户
        User user = userMapper.getByOpenid(openid);
        if(user != null){
            return user;
        }
        //是新用户则自动注册
        User newUser = User.builder()
                .openid(openid)
                .createTime(LocalDateTime.now())
                .build();
        userMapper.insert(newUser);
        return null;
    }
    private String getOpenid(String code){
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put("appid",weChatProperties.getAppid());
        paramMap.put("secret",weChatProperties.getSecret());
        paramMap.put("js_code",code);
        paramMap.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, paramMap);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
